Assuming your design code as B31.3 for ¾” wall thickness no PWHT is required for the weld overlay, since it is not a metal to metal contact, any Stainless steel weld overlay can serve the purpose.
From:
Sent: Tuesday, September 08, 2009 9:33 AM
To:
Subject: [MW:3133] Weld over lay on the inner surface of an elbow
We have a problem of erosion by steam + water jet.
Material of the elbow is A234-WPBW Thickness: 0.75” Diameter: 28” Long Radius
We would like to have hard facing on the inner surface without the need for PWHT.
Can any one suggest suitable WPS for the same?
Regards
Chandulal S Vithlani
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